Chemical Composition and Kinetic Properties of Granular Methanogenic Sludge Grown on Propionate

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The chemical composition and kinetic properties of propionate-grown methanogenic granules were analyzed as a function of the diameter of the granules (range : 0.1-3.0 mm in diameter). No significant variation in the chemical composition of the granules was observed. All granules contained large amounts of ash (between 53 and 59%). Extracellular polymers extracted from the granules were equivalent to 86-99 mg/g mixed-liquor volatile suspended soilds (MLVSS), in which proteins, carbohydrates, and nucleic acids were the main constituents. The apparent substrate saturation constant (K_5) value for propionate utilization was clearly influenced by the diameter of granules, although the maximum rate of propionate utilization was virtually constatnt, irrespective of the diameter. This indicates that the influence of mass transfer limitation was more pronounced in larger granules, especially at lower propionate concentrations.
公益社団法人日本生物工学会の論文
1991-11-25